With Iranian support, Hezbollah—a predominantly Shi’ite group and a US-designated terrorist organization—has emerged as the most powerful military and political force in Lebanon. Through extensive soft-power efforts, Iran promotes its ideological and political agenda in Lebanon at the expense of American interests. To promote stability in Lebanon, the US must counter Iranian influence, strengthen Lebanese state institutions, and partner with moderate leaders from all Lebanese ethnic and religious groups, including the Shi’ites, to contain and marginalize Hezbollah.